7gmc2,
You can use your stock m/c. All you would need to do is extend the brace and make a new, longer, plunger rod (at least that was my experience). I used a Corvette (1974) m/c because I am going to use rear disk brakes eventually, plus I used my Vette to compare sizes so I knew it would fit.
A 3/4 ton m/c would not really make sense to use because the lines are backwards, with the rear brake lines at the front of the m/c.
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Toys:
72 K5 Blazer
74 Vette
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